A rare pair of engine failures for Richard Childress Racing knocked contenders Kevin Harvick and Jeff Burton out of the Daytona 500. Harvick's car lasted only 22 laps before sustaining what his team suspected was a broken engine block. Burton's car then gave up after 92 laps. Harvick said his problems probably didn't have anything to do with concerns about overheating when acting as the pushing car in the two-car style of drafting that has dominated Daytona Speedweeks. Read more: http://sports.espn.go.com/rpm/nascar/cup/news/story?id=6142014